If you are upgrading from a version earlier than 2.5
The following functions have been renamed: ghostpool_page_settings has been changed to ghostpool_init_variables and ghostpool_page_variables has been changed to ghostpool_loop_variables.
If you are upgrading from a version earlier than 1.14
The theme now includes a socialize.pot translation file instead of socialize.po and socialize.mo files. This file is identical to socialize.po and when saved generates the .po and .mo files. Nothing has changed, you still need socialize.po and socialize.mo and they can stay in the socialize/languages/ folder but you now also have the option of adding these files to wp-content/languages/themes/ or inside your child theme so they are not overwritten when updating the theme. For more information please see Translating The Theme (Localisation).
The text from the registration email is no longer translatable from the theme plugin. You now need to translate this text from the WordPress core language file.
If you are upgrading from a version earlier than 1.11
Updating Visual Composer through the theme is not currently working. You will need update the plugin manually. From your theme download go to socialize-theme/socialize/lib/plugins/ and unzip js_composer.zip. Upload the "js_composer" folder to the wp-content/plugins/ directory overwriting the existing "js_composer" folder.
If you are upgrading from a version earlier than 1.6